Currently, several new strains are giving scientists pause.

One is a variant that wasfirst identified in the U.K. New strains of the virus have also been found in South Africa and Brazil.

While they don’t seem to spread as quickly as the U.K. strain,Dr.

Researchers working on COVID-19 vaccine

Anthony Faucihas warned that they could be more dangerous in the long term.

We don’t need to do that right now.

That’s the best protection against this evolution."

Dr. Anthony Fauci speaking

“I think of it as an insurance policy.

I don’t know if we need it, and I hope we don’t.”

He added, “New strains will continue to emerge and we’ll continue to evaluate them.”

Moderna COVID-19 vaccine